Hoisting hook



Dec. 1, a J. CLARK HOISTING HOOK Filed Sept. 15, 1925 2 Sheets-Sheet 1 Dec. 1 1925 1.563.341

J. CLARK HOISTING HOOK Filed Sept. 15 192 2 Sheets-Sheet 2 Patented Dec. 1, 1925.

units i JOHN CLARK. OF BUFFAIAQ, YORK.

excise-me new;

Application and, September s, 1925. Serial sc -a1.

reliably connected with the load. and not become fouled with other oojec in the accompanying drawin Figure l, is a vertical longitudinal section o'i' a hoisting hook embodying iny vcntion.

l igure 2, is a horizontal section of the same taken on line 2- -2, Fig. 1.

Figure 3, is a front elevation of the'hoisting hook.

- Figure at, isa horizontal section taken on line d4-, Fig. 3.

Figure 5, is a fragmentary vertical section taken *on line 55, Fi showing the clamping screw not locked against backward rotation.

Figure (3, is a similar view showing the clan'iping screw nut uulockeiil and free to unscrew. i

.iTigure 7, hacking pin. Fi d is a. fragmentary vertical lion taken on iine 8-8, l ig. 1.

Similar characters of reference indicate like parts throughout the several views,

The main part or oody of this hoisting hook comprises an upright shank 10 and a forwardly and upwardly turnedba( :k 11 at the lower end of this shank forming an upwardly opening month between this shank and beak which is adapted to receive the ring, rope or other means whereby the load v to be lifted attached to the hoisting hook. At its upper end the shank is provided with means whereby the same is connected to the hoisting niechanisnti. in the present instance'this is accomplished by means of an eye 12 which overhangs forwardly fro n the upper end of the shank vand receives the lowermostflink 13 of a hoisting chain forniingpart oi the hoisting tackle or incrhr'inis a perspective view of the isin, such as that now in common use for this purpose.

Movable into and out of a position across the mouth of the hoisting hook a keeper or latch 1i which is preferably permanently connected with the upper part of the shank while its lower end is detachably connected with the beak of the hoisting hook so as to permit of opening and closing the mouth of the same.

At its lower end this keeper or latch is provided with aninwardly projecting hook 15 which in its operative position projects inwardly throughan opening 16 in the upper part o1 "the beak."

' At is upper end the keeper is provided with an upwardly projecting foot 1?, the

inner side of which is adapted to, bear against the opposing upper part of the inner side of the shank 10; The upper part of the inner side of this foot is rounderh g h wn at lg and adapted to engage with the adjacent rounded surface 19 on the upper part of the inner side of the shank 10 and thereby permit the keeper to he locked or turned in a vertical plane parallel with the beak 11 and shank 10 for the purpose of engagingand disengaging the hook 1'5 of the keeper withthe opening 16. The foot of the keeper is provided with a vertical slotQO which receives thecentral part of a clamping or tightening bolt 21 which latter is connected at its inner end with the adjacent upper part of the shank 10 by means of a screw joint 22, as shown in l and 2. The outer end of the bolt 21 is provided with a screwthread 28, preferably of the ac ne type which receives a clamping screw nut 24 adapted to engage with the router sideof the foot 17 of the keeper and press the $211116 against the shank lOit'or the purpose of holding the keeper across the mouth of the ,hoisting hook and in an interlocked position with the beak oi the same. In order to permit thekeeper to rock freely in a vertical plane parallel with the shank 10 and beak 11 upon loosening the clamping bolt 24 only to a moderate-extent the coroperating surfaces of the clamping nut 24 andthe coupling footl? of thetkeepor are constructed'so that a spherical joint or ball joint is formed between the same, this being accomplishedby -making the inner side 25 of. the nut of seer-ex spl'ierical form and the outer side of the foot 17 of concave spherical form, as shown in Figs. 1 and 2.

Complete detachment of the clamping nut 2-l from the clamping and pivot bolt 2-1 is prevented by means of a stop device which preferably consists of a stop disk 2'? arranged on the outer end of the clamping bolt 21 and over-hanging the sides of the same and detachably connected with this bolt by means of a screw 28 or other suitable means. In order to avoid making the clamping bolt 21 unduly long and still permit the clamping nut 2 x to be unscrewed as far as necessary to completely release the keeper a recess 29 is formed on the outer side of this nut which receives the stop disk 27 in the outermost position of this nut.

Turning of the clamping nut 2 t may be eti'ected in any suitable manner for instance by providing the periphery thereof with teeth 30 shown in Fig. l, and also by inserting a wrench pin into one or another of a plurality of wrench openings 81 formed in difl'erent parts of the periphery of this screw nut, as shown in Figs. l and \Vhen this hoisting hook in use and the keeper is locked in a position across the mouth of the same the hook of the kee er engages with the opening 16 of the beak 11, the foot 17 of the keeper engages the lower end of its slot 20 with the clamping bolt 21 and the screw nut 2st presses this foot against the upper part of the shank 10, as shown by full lines in Fig. 1. For the purpose of opening the mouth of the hook in order to permit the load to be detached from the month thereof and another load substituted, the screw nut 24 is first loosened by unscrewing the same sufficiently for this purpose after which the keeper may be turned in a vertical plane parallel with the plane of the shank 10 and beak 11., at which time the foot 17 at the upper end of the keeper will slide downwardly between the nut and shank 10 until the upper part of the slot 2-0 of the foot engages with the top of the clamping bolt 21, thereby releasing the hook 145 of the keeper from the beak 11, as shown by dotted lines let in Fig. 1. The keeper may now be swung in a vertical plane at right angles to the plane of the shank and beak of the hoisting hook for the purpose of completely uncovering the mouth of the hoisting hook, this extreme opening position of the keeper being represented by dotted lines let" in Fig. 1.

Upon reversing the operation of the parts as just described the keeper will be again returned to its working position for closing the mouth of the hoisting hook and confining the load therein.

In order to produce a positive upward pull of the shank on the keeper in addition to the frictional pull against the same by means of the clamping bolt and nut an upwardly facing shoulder 32 is formed on the central part of the inner side of the shank 10 which shoulder engages with the adjacent upper part of the surface of the keeper, as shown in Fig. 1.

In order to positively interlock the stub bolt 21 with the shank of the hoisting hook and prevent this bolt from unscrewing or shifting its position circumferentially upon tightening or loosening the clamping screw nut 24 a locking or retaining device is provided which in the preferred form shown in the drawings is constructed as follows 1-- The numeral represents a key face preferably of flat form arranged on the lower side of the bolt 21 and formed thereon by cutting away a portion of the peripheral surface of this bolt adjacent to the front side of the shank of the hook. Immediately below this bolt and adjacent to the key face 50 the front side of the shank and the hook is provided with a recess 51 which registers with the key seat of the bolt 2L In this key recess is arranged a locking key 52 which is preferably secured therein by means of a driving fit and which engages its upper flat side with the key face 52 on the bolt 21, as shown in Figs. 1 and 8.

By this means an obstruction provided in the path of rotation of the clamping bolt 21 which positively prevents the latter from being turned and thereby insures against loosening or unscrewing of this bolt when unscrewing the clamping nut :24, thereby reliably holding the several parts of the hoisting hook in their properly assembled position so that the same is always in condition for use and thus insures maximum safety to the operators while the hook is employed as part of a hoisting tackle for lifting or transporting the load from one place to another.

In order to prevent the clamping screw nut 24 from being accidently unscrewed or loosened and render the attachment of the hook to the load unreliable means are provided whereby this clamping screw nut after being tightened on the bolt 21 and against the foot of the keeper will be locked against turning baclnvardly, the locking means for this purpose being manually controlled so that the clamping screw nut may be locked or unlocked at will. In the preferred form of this locking device the same utilizes the teeth 30 on the periphery of the clamping screw nut as a part of these means, and in the preferred organization in which these teeth are thus used each tooth is provided with an inclined front side and an inclined rear side so that in effect the several teeth on the clamping screw nut form an annular ratchet rim. Each of these teeth is adapted to be engaged by a locking pawl llll) Ill) 53 which is mounted on the keeper and adapted to be moved into and out of the path oi? the ratchet teeth so that when this pawl engages with one o f the ratchet teeth, as shown in Fig. 5, the screw nut 2-1 will be held against turning backwardly, while upon disengagingtl is pawl from the respective ratchet teeth, as shown in Fig. (3, the path of the ratchet rim will be clear and the clamping screw nut can be turned freely either forwardly or bftCkWfl-ldl) on the bolt 21. In the preferred construction this locking pawl is formed on the periphery of a locking pin 54 which is rotatably mounted in a recess 59 on the front side of the keeper immediately below the screw nut 24 when the keeper is in its operative position. The locking pin 54 is preterably connected with the keeper by means of an external screw thread 55 on the inner or rear end thereof engaging with the corresponding screw thread at the inner end of the recess 59, whereby this screw joint not only serves as a means for permitting the locking pin to rotate for engaging and disengaging the pawl 53 with the ratchet rim of the nut 24-. but it also serves as the means for connecting this locking pin with the keeper in a manner which isldurable and reliable in operation, The turning of this locking pin for moving the locking pawl into and out of engagement with the ratchet rim of the screw nut may be effected in various ways, for instance by applying a wrench to aprismatic head or enlargement 56 at the front end of the locking pin or this same result may be obtained by a tightening rod or pawl inserted in one or the other of a plurality of pin openings 57 formed in the facets of the head 56 of the locking pin. In the preferred construction the head 56 overhangs the front face of the clamping screw 24- whcn the parts are in their operative position, but il. at any time it is desired or necessary to more the clamping screw nut 2-l and the locking pin independently of each other, this can be done by turning the keeper into its uppermost position and also sliding the same lengthwise upwardly into the position indicated by dotted lines let in Fig. 1, whereby the screw nut and locking pin clear each other su'liiciently to avoid interference and permit them to "be readily assembled and dismembered relative to the other parts of the hoisting hook.

In order to prevent the head 56 of the locking pin 54 from becoming caught against an obstruction while raising the hoisting hook or when lowering anything else close to this hoisting hook the upper side of this head 56 is bevelled or rounded shown at 58 in Figs. 1, 2, 4 and 7, thereby causing anything which engages this particular part of the locking pin to glance oli' and be deflected laterally therefrom, thereby preventing any interference with the ee movement .01 the hook and lso avoid fouling of the same with any twisting tackle. In the preferred construction this bcvel led surface is prelier-a bly arrang l in rear of the center of this belt when the latter is in its locked position, as shown in 3 and i, thereby causing any engagement of an obstruction with the front upper part of this hook to further tighten or move the same in the direction for locking the ela-nziping screw instead of exerting a tendency which would loosen the same.

By means of this locking device for the clamping screw nut the latter is positively looked in its tightened position and prevented from loosening or turning backward l-y so that the keeper is reliably held in its locked position in engagement with the beak of the hoisting hook and all danger of the hoisting hook becoming detached from the load which it is carrying is avoided, thereby furnishing the iii-arimum safety for the operators who are using this hook as a part of a hoisting tackle.

it will be noted that in this hoisting book no springs or similar resilient means are employed which are liable to become weak or inoperative in time and thus impair the eiliciency of the hook, instead all of the devices in this hoisting hook are very rigid and of sturdycharacter which are capable of withstanding rough usage without liability of becoming deranged or rendered inoperative.

I claim as my invention 1. A hoisting hook having a shank and a beak, a clamping bolt arranged on the front side of said shank, a keeper movable into and out of a position across the mouth of said hook and pivotally mounted at its upper end on said bolt and adapted to enand itlisengage its lower end with said beak, a screw nut workii'ig on the thread of said bolt, and locking means for preventing said screw nut from turning backwardly.

2. A hoisting hook having a shank and a beak, a clamping bolt arranged on the front side of said shank, a keeper movable into and out of av position across the mouth of said hook and pivotally mounted at its upper end on said bolt and adapted to engage and disengage its lower end with said beak, a screw nut working on the thread of said bolt, locking means for preventing said screw nut from turning baokwardly consisting of an annular row of teeth arranged on the periphery of the screw nut, and a locking member movably mounted on the shank and adapted to be engaged and disengaged with the teeth of said screw nut.

3. A hoisting hook having a shank and &

a beak, a clamping bolt arranged on the front side of said shank, a keeper movable into and out of a position across the mouth of said hook and pivotally mounted at its upper end on said bolt and adapted to engage and disengage its lower end with said beak, a screw nut working on the thread of said bolt, locking means for 'ireventing said screw nut from turning backwardly consisting of an annular row of ratchet teeth arranged on the periphery of said screw nut, and a locking pin pivotally mounted on said shank and provided on its periphery with a pawl adapted to be moved into and out of engagement with a ratchet tooth of said nut.

4. A hoisting hook having a shank and a beak, a clamping bolt arranged on the front side of said shank, a keeper movable into and out of a position across the mouth of said hook and pivotally mounted at its upper end on said bolt and adapted to engage and disengage its lower end with said beak, a screw nut working on the thread of said bolt, locking means for preventing said screw nut from turning baekw: rdly consisting of an annular row of ratchet teeth arranged on the periphery of said screw nut, and a locking pin pivotally mounted on said shank and provided on its periphery with a pawl adapted to be moved into and out of engagement with a ratchet toot-h of said nut, said locking pin being provided at its inner endwith an external screw thread and said shank being provided with a threaded opening which receives the threaded part of said pin.

5. A hoisting hook having a shank and a beak, a clamping bolt arranged on the front side of said shank, a keeper movable into and out of a position across the mouth of said hook and pivotally mounted at its upper end on said bolt and adapted to engage and disengage its lower end with said beak, a screw nut working on the thread of said bolt, locking means for preventing said screw nut from turning baclnvardly, consisting of an annular row of ratchet teeth arranged on the periphery of said screw nut, and a locking pin pivotall mounted on said shank and provided on its periphery with a pawl adapted to be moved into and out of engagement with a ratchet tooth of said nut, said locking pin being provided at its inner end with an external screw thread and said. shank being provided with a threaded opening which receives the threaded part of said pin and the outer end of said pin being provided with a head.

6. A hoisting hook having a shank and a beak, a clamping bolt arranged on the front side of said shank, a keeper movable into and out of a position across the mouth of said hook and pivotally mounted at its upper end on said bolt and adapted to engage and disengage its lower end with said beak, a screw nut working on the thread of said bolt, and locking means for preventing said screw nut from turning backwardi y consisting of an annular row of ratchet teeth arranged on the periphery of said screw nut, and a locking pin pivotally mounted on said shank and provided on its periphery with a pawl adapted to be moved into and out of engagement with a ratchet tooth of said nut, said locking pin being provided at its inner end with an external screw thread and said shank being provided with a threaded opening which receives the threaded part of said pin, and the outer end of said pin being provided with a head, the upper side of which is rounded.

7. A hoisting hook having a shank and a beak, a clamping bolt arrai'iged on the front side of said shank, a keeper movable into and out of a position across the mouth of said hook and pivotally mounted at its upper end on said bolt and adapted to engage and disengage its lower end. with said beak, a screw nut working on the thread of said bolt, lockin means for preventing said screw nut from turning baokwardly and means for preventing said bolt from turning on said shank consisting of a key arranged on the shank and engaging with the side of the bolt.

8. A hoisting hook having a shank and a beak, a clamping bolt arranged on the front side of said shank, a keeper movable into and out of a position across the mouth of said hook and pix otally mounted at its upper end on said bolt and adapted to eugage and disengage its lower end with said beak, a screw nut working on the thread of said bolt, locking means for preventing said screw nut from turning backwardly, said bolt being provided 011 its periphery with a key face and said shank being provided on its front side opposite said key face with a key recess, and a locking key arranged in said recess and engaging with said face.

JOHN CLARK.

ill) 

